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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef V8ArrayBufferViewCustom_h
     32 #define V8ArrayBufferViewCustom_h
     33 
     34 #include "ArrayBuffer.h"
     35 
     36 #include "V8ArrayBuffer.h"
     37 #include "V8Binding.h"
     38 #include "V8Proxy.h"
     39 
     40 namespace WebCore {
     41 
     42 // Template function used by the ArrayBufferView*Constructor callbacks.
     43 template<class ArrayClass, class ElementType>
     44 v8::Handle<v8::Value> constructWebGLArrayWithArrayBufferArgument(const v8::Arguments& args, WrapperTypeInfo* type, v8::ExternalArrayType arrayType, bool hasIndexer)
     45 {
     46     ArrayBuffer* buf = V8ArrayBuffer::toNative(args[0]->ToObject());
     47     if (!buf)
     48         return throwError("Could not convert argument 0 to a ArrayBuffer");
     49     bool ok;
     50     uint32_t offset = 0;
     51     int argLen = args.Length();
     52     if (argLen > 1) {
     53         offset = toUInt32(args[1], ok);
     54         if (!ok)
     55             return throwError("Could not convert argument 1 to a number");
     56     }
     57     if ((buf->byteLength() - offset) % sizeof(ElementType))
     58         return throwError("ArrayBuffer length minus the byteOffset is not a multiple of the element size.", V8Proxy::RangeError);
     59     uint32_t length = (buf->byteLength() - offset) / sizeof(ElementType);
     60     if (argLen > 2) {
     61         length = toUInt32(args[2], ok);
     62         if (!ok)
     63             return throwError("Could not convert argument 2 to a number");
     64     }
     65 
     66     RefPtr<ArrayClass> array = ArrayClass::create(buf, offset, length);
     67     if (!array) {
     68         V8Proxy::setDOMException(INDEX_SIZE_ERR);
     69         return notHandledByInterceptor();
     70     }
     71     // Transform the holder into a wrapper object for the array.
     72     V8DOMWrapper::setDOMWrapper(args.Holder(), type, array.get());
     73     if (hasIndexer)
     74         args.Holder()->SetIndexedPropertiesToExternalArrayData(array.get()->baseAddress(), arrayType, array.get()->length());
     75     return toV8(array.release(), args.Holder());
     76 }
     77 
     78 // Template function used by the ArrayBufferView*Constructor callbacks.
     79 template<class ArrayClass, class ElementType>
     80 v8::Handle<v8::Value> constructWebGLArray(const v8::Arguments& args, WrapperTypeInfo* type, v8::ExternalArrayType arrayType)
     81 {
     82     if (!args.IsConstructCall())
     83         return throwError("DOM object constructor cannot be called as a function.");
     84 
     85     int argLen = args.Length();
     86     if (!argLen) {
     87         // This happens when we return a previously constructed
     88         // ArrayBufferView, e.g. from the call to <Type>Array.subset().
     89         // The V8DOMWrapper will set the internal pointer in the
     90         // created object. Unfortunately it doesn't look like it's
     91         // possible to distinguish between this case and that where
     92         // the user calls "new <Type>Array()" from JavaScript. We must
     93         // construct an empty view to avoid crashes when fetching the
     94         // length.
     95         RefPtr<ArrayClass> array = ArrayClass::create(0);
     96         // Transform the holder into a wrapper object for the array.
     97         V8DOMWrapper::setDOMWrapper(args.Holder(), type, array.get());
     98         // Do not call SetIndexedPropertiesToExternalArrayData on this
     99         // object. Not only is there no point from a performance
    100         // perspective, but doing so causes errors in the subset() case.
    101         return toV8(array.release(), args.Holder());
    102     }
    103 
    104     // Supported constructors:
    105     // WebGL<T>Array(n) where n is an integer:
    106     //   -- create an empty array of n elements
    107     // WebGL<T>Array(arr) where arr is an array:
    108     //   -- create a WebGL<T>Array containing the contents of "arr"
    109     // WebGL<T>Array(buf, offset, length)
    110     //   -- create a WebGL<T>Array pointing to the ArrayBuffer
    111     //      "buf", starting at the specified offset, for the given
    112     //      length
    113 
    114     if (args[0]->IsNull()) {
    115         // Invalid first argument
    116         // FIXME: use forthcoming V8Proxy::throwTypeError().
    117         return V8Proxy::throwError(V8Proxy::TypeError, "Type error");
    118     }
    119 
    120     // See whether the first argument is a ArrayBuffer.
    121     if (V8ArrayBuffer::HasInstance(args[0]))
    122       return constructWebGLArrayWithArrayBufferArgument<ArrayClass, ElementType>(args, type, arrayType, true);
    123 
    124     uint32_t len = 0;
    125     v8::Handle<v8::Object> srcArray;
    126     bool doInstantiation = false;
    127 
    128     if (args[0]->IsObject()) {
    129         srcArray = args[0]->ToObject();
    130         if (srcArray.IsEmpty())
    131             return throwError("Could not convert argument 0 to an array");
    132         len = toUInt32(srcArray->Get(v8::String::New("length")));
    133         doInstantiation = true;
    134     } else {
    135         bool ok = false;
    136         int32_t tempLength = toInt32(args[0], ok); // NaN/+inf/-inf returns 0, this is intended by WebIDL
    137         if (ok && tempLength >= 0) {
    138             len = static_cast<uint32_t>(tempLength);
    139             doInstantiation = true;
    140         }
    141     }
    142 
    143     RefPtr<ArrayClass> array;
    144     if (doInstantiation)
    145         array = ArrayClass::create(len);
    146     if (!array.get())
    147         return throwError("ArrayBufferView size is not a small enough positive integer.", V8Proxy::RangeError);
    148 
    149     if (!srcArray.IsEmpty()) {
    150         // Need to copy the incoming array into the newly created ArrayBufferView.
    151         for (unsigned i = 0; i < len; i++) {
    152             v8::Local<v8::Value> val = srcArray->Get(v8::Integer::NewFromUnsigned(i));
    153             array->set(i, val->NumberValue());
    154         }
    155     }
    156 
    157     // Transform the holder into a wrapper object for the array.
    158     V8DOMWrapper::setDOMWrapper(args.Holder(), type, array.get());
    159     args.Holder()->SetIndexedPropertiesToExternalArrayData(array.get()->baseAddress(), arrayType, array.get()->length());
    160     return toV8(array.release(), args.Holder());
    161 }
    162 
    163 template <class CPlusPlusArrayType, class JavaScriptWrapperArrayType>
    164 v8::Handle<v8::Value> setWebGLArrayHelper(const v8::Arguments& args)
    165 {
    166     if (args.Length() < 1) {
    167         V8Proxy::setDOMException(SYNTAX_ERR);
    168         return notHandledByInterceptor();
    169     }
    170 
    171     CPlusPlusArrayType* impl = JavaScriptWrapperArrayType::toNative(args.Holder());
    172 
    173     if (JavaScriptWrapperArrayType::HasInstance(args[0])) {
    174         // void set(in WebGL<T>Array array, [Optional] in unsigned long offset);
    175         CPlusPlusArrayType* src = JavaScriptWrapperArrayType::toNative(args[0]->ToObject());
    176         uint32_t offset = 0;
    177         if (args.Length() == 2)
    178             offset = toUInt32(args[1]);
    179         ExceptionCode ec = 0;
    180         impl->set(src, offset, ec);
    181         V8Proxy::setDOMException(ec);
    182         return v8::Undefined();
    183     }
    184 
    185     if (args[0]->IsObject()) {
    186         // void set(in sequence<long> array, [Optional] in unsigned long offset);
    187         v8::Local<v8::Object> array = args[0]->ToObject();
    188         uint32_t offset = 0;
    189         if (args.Length() == 2)
    190             offset = toUInt32(args[1]);
    191         uint32_t length = toUInt32(array->Get(v8::String::New("length")));
    192         if (offset > impl->length()
    193             || offset + length > impl->length()
    194             || offset + length < offset)
    195             // Out of range offset or overflow
    196             V8Proxy::setDOMException(INDEX_SIZE_ERR);
    197         else
    198             for (uint32_t i = 0; i < length; i++)
    199                 impl->set(offset + i, array->Get(v8::Integer::NewFromUnsigned(i))->NumberValue());
    200 
    201         return v8::Undefined();
    202     }
    203 
    204     V8Proxy::setDOMException(SYNTAX_ERR);
    205     return notHandledByInterceptor();
    206 }
    207 
    208 }
    209 
    210 #endif // V8ArrayBufferViewCustom_h
    211